Added doc on update/upgrade steps (#661)
Added doc on update/upgrade steps (#661)

*  Added doc on update steps

* Updating the filename and a few other minor things

* Updating title of update document.

markofu/security_monkey,Netflix/security_monkey,stackArmor/security_monkey,Netflix/security_monkey,stackArmor/security_monkey,markofu/security_monkey,Netflix/security_monkey,stackArmor/security_monkey,markofu/security_monkey,stackArmor/security_monkey,markofu/security_monkey,stackArmor/security_monkey,Netflix/security_monkey,Netflix/security_monkey,markofu/security_monkey